/* vietnamese */
@font-face {
  font-family: 'Bricolage Grotesque';
  font-style: normal;
  font-weight: 700 800;
  font-stretch: 100%;
  font-display: swap;
  src: url(fonts/bricolage-grotesque-700-800-vietnamese.woff2) format('woff2');
  unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB;
}
/* latin */
@font-face {
  font-family: 'Bricolage Grotesque';
  font-style: normal;
  font-weight: 700 800;
  font-stretch: 100%;
  font-display: swap;
  src: url(fonts/bricolage-grotesque-700-800-latin.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
/* vietnamese */
@font-face {
  font-family: 'Be Vietnam Pro';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url(fonts/be-vietnam-pro-400-vietnamese.woff2) format('woff2');
  unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB;
}
/* latin */
@font-face {
  font-family: 'Be Vietnam Pro';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url(fonts/be-vietnam-pro-400-latin.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
/* vietnamese */
@font-face {
  font-family: 'Be Vietnam Pro';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url(fonts/be-vietnam-pro-500-vietnamese.woff2) format('woff2');
  unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB;
}
/* latin */
@font-face {
  font-family: 'Be Vietnam Pro';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url(fonts/be-vietnam-pro-500-latin.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
/* vietnamese */
@font-face {
  font-family: 'Be Vietnam Pro';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url(fonts/be-vietnam-pro-600-vietnamese.woff2) format('woff2');
  unicode-range: U+0102-0103, U+0110-0111, U+0128-0129, U+0168-0169, U+01A0-01A1, U+01AF-01B0, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329, U+1EA0-1EF9, U+20AB;
}
/* latin */
@font-face {
  font-family: 'Be Vietnam Pro';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url(fonts/be-vietnam-pro-600-latin.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
/* cjk */
@font-face {
  font-family: 'Ma Shan Zheng';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url(fonts/ma-shan-zheng-400-cjk.woff2) format('woff2');
  unicode-range: U+5c07, U+5e25, U+695a, U+6cb3, U+6f22, U+754c;
}
/* ------------------------------------------------------------------
   Cờ Tướng — trang giới thiệu. Bảng màu lấy từ chính game (UiPalette):
   nâu mực, vàng khung, đỏ son. Cả trang là một bàn cờ: nền là lưới đường kẻ,
   các mục cách nhau bằng dòng sông 楚河 漢界, nút bấm là quân cờ.
   ------------------------------------------------------------------ */
:root {
  --lac: #1a100a;
  --lac-2: #241610;
  --paper: #f0dcbb;
  --paper-soft: #ccb799;
  --gold: #dca454;
  --gold-hi: #f6d089;
  --gold-lo: #a06f2c;
  --seal: #c4432b;
  --seal-deep: #8f2a18;
  --line: rgba(220, 164, 84, .22);
  --display: 'Bricolage Grotesque', 'Be Vietnam Pro', system-ui, sans-serif;
  --body: 'Be Vietnam Pro', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --brush: 'Ma Shan Zheng', 'Noto Serif CJK SC', 'Songti SC', serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { color-scheme: dark; background: var(--lac); scroll-behavior: smooth; }
body {
  margin: 0;
  font: 400 1.0625rem/1.7 var(--body);
  color: var(--paper-soft);
  background:
    radial-gradient(ellipse 70% 40% at 78% 0%, rgba(196, 67, 43, .16), transparent 70%),
    linear-gradient(rgba(220, 164, 84, .05) 1px, transparent 1px) 0 0 / 84px 84px,
    linear-gradient(90deg, rgba(220, 164, 84, .05) 1px, transparent 1px) 0 0 / 84px 84px,
    var(--lac);
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;   /* hình trang trí tràn mép không làm trang rộng ra trên điện thoại */
}
img { display: block; max-width: 100%; }
a { color: var(--gold-hi); text-underline-offset: 3px; }
a:hover { color: #fff1cf; }
:focus-visible { outline: 2px solid var(--gold-hi); outline-offset: 3px; border-radius: 4px; }
strong { color: var(--paper); font-weight: 600; }

.wrap { width: min(1120px, 100% - 48px); margin-inline: auto; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--paper); color: var(--lac); padding: 8px 14px; border-radius: 8px; z-index: 10; }
.skip:focus { left: 8px; }

/* ---- Đầu trang ---- */
.top { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 22px 0; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; color: var(--paper); }
.brand img { width: 44px; height: 44px; border-radius: 11px; border: 1px solid var(--gold-lo); }
.brand span { font: 800 1.4rem/1 var(--display); letter-spacing: -.01em; white-space: nowrap; }
.top nav { display: flex; gap: 26px; font-size: .95rem; white-space: nowrap; }
.top nav a { color: var(--paper-soft); text-decoration: none; }
.top nav a:hover, .top nav a[aria-current] { color: var(--gold-hi); }
.top nav a.lang { padding: 1px 8px; border: 1px solid var(--gold-lo); border-radius: 6px; font-size: .8rem; letter-spacing: .06em; }

/* ---- Hero ---- */
.hero { display: grid; grid-template-columns: 1.1fr .9fr; gap: 56px; align-items: center; padding: 40px 0 88px; }
.hero h1 {
  margin: 0 0 22px;
  font: 800 clamp(2.7rem, 7.2vw, 5.4rem)/.98 var(--display);
  letter-spacing: -.025em;
  color: var(--paper);
  text-wrap: balance;
}
.hero .app-name { margin: 0 0 14px; font: 700 1.05rem/1.3 var(--display); letter-spacing: .04em; color: var(--gold); }
.hero h1 em { font-style: normal; color: var(--gold); white-space: nowrap; }
.hero .lead { max-width: 33rem; margin: 0 0 34px; font-size: 1.15rem; }
.hero .note { margin: 16px 0 0; font-size: .88rem; color: var(--paper-soft); opacity: .8; }

/* Nút = quân cờ + nhãn, như các nút trong game */
.cta {
  display: inline-flex; align-items: center; gap: 14px;
  padding: 9px 28px 9px 9px;
  border-radius: 999px;
  border: 1px solid var(--gold-lo);
  background: linear-gradient(#cf4d33, var(--seal-deep));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .28), 0 12px 32px rgba(0, 0, 0, .5);
  color: #fff3dc; text-decoration: none;
  font: 700 1.1rem/1.2 var(--display);
  transition: transform .18s ease, box-shadow .18s ease;
}
.cta:hover { color: #fff; transform: translateY(-2px); box-shadow: inset 0 1px 0 rgba(255, 255, 255, .28), 0 16px 36px rgba(0, 0, 0, .55); }
.cta .disc {
  width: 54px; height: 54px; border-radius: 50%;
  display: grid; place-items: center;
  background: radial-gradient(circle at 35% 30%, #fbecc9, #e3c48a);
  border: 3px solid var(--gold);
  box-shadow: inset 0 0 0 3px rgba(184, 58, 36, .0), 0 2px 6px rgba(0, 0, 0, .4);
  color: #b83a24; font: 400 1.9rem/1 var(--brush);
}
.cta small { display: block; font: 500 .78rem/1.2 var(--body); opacity: .85; }

.hero-art { position: relative; display: grid; place-items: center; padding: 20px 0; }
.hero-art .palace { position: absolute; top: 50%; left: 50%; width: min(540px, 120%); transform: translate(-50%, -50%); opacity: .38; }
.hero-art .glyph {
  position: absolute; left: -16%; bottom: -10%;
  font: 400 clamp(11rem, 26vw, 19rem)/1 var(--brush);
  color: rgba(220, 164, 84, .11);
  pointer-events: none; user-select: none;
}
.phone {
  position: relative;
  width: min(310px, 72vw); aspect-ratio: 540 / 880;
  padding: 10px; border-radius: 36px;
  background: #0c0705;
  border: 1px solid rgba(220, 164, 84, .38);
  box-shadow: 0 44px 90px rgba(0, 0, 0, .65), 0 0 0 7px rgba(220, 164, 84, .06);
  transform: rotate(3deg);
}
.phone img { width: 100%; height: 100%; object-fit: cover; border-radius: 27px; }
.phone.tilt-left { transform: rotate(-2.5deg); }

/* ---- Sông: 楚河 漢界 ---- */
.river { display: flex; align-items: center; gap: 22px; padding: 10px 0; }
.river span { font: 400 clamp(1.6rem, 4vw, 2.4rem)/1 var(--brush); color: var(--gold); letter-spacing: .12em; }
.river i {
  flex: 1; height: 12px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='44' height='12'%3E%3Cpath d='M0 6Q11 0 22 6T44 6' fill='none' stroke='%23dca454' stroke-opacity='.5' stroke-width='1.4'/%3E%3C/svg%3E") repeat-x center;
}

/* ---- Tính năng ---- */
.features { display: grid; grid-template-columns: 1fr 330px; gap: 72px; align-items: start; padding: 72px 0 96px; }
.features h2, .closing h2 {
  margin: 0 0 30px;
  font: 800 clamp(1.9rem, 4.2vw, 2.8rem)/1.05 var(--display);
  letter-spacing: -.02em; color: var(--paper);
}
.feat { list-style: none; margin: 0; padding: 0; }
.feat li { display: grid; grid-template-columns: 130px 1fr; gap: 8px 28px; padding: 24px 0; border-top: 1px solid var(--line); }
.feat li:last-child { border-bottom: 1px solid var(--line); }
.feat .tag { padding-top: 5px; font: 600 .76rem/1.4 var(--body); letter-spacing: .14em; text-transform: uppercase; color: var(--gold); }
.feat h3 { margin: 0 0 6px; font: 700 1.4rem/1.2 var(--display); color: var(--paper); letter-spacing: -.01em; }
.feat p { margin: 0; max-width: 34rem; }
.features aside { position: sticky; top: 28px; display: grid; place-items: center; padding-top: 44px; }

/* ---- Kết ---- */
.closing { text-align: center; padding: 84px 0 104px; }
.closing img { width: 200px; height: 200px; margin: 0 auto 34px; border-radius: 40px; border: 1px solid var(--gold-lo); box-shadow: 0 30px 70px rgba(0, 0, 0, .6), 0 0 90px rgba(196, 67, 43, .22); }
.closing h2 { margin-bottom: 14px; font-size: clamp(2.2rem, 6vw, 3.6rem); }
.closing p { max-width: 30rem; margin: 0 auto 30px; }

/* ---- Chân trang ---- */
.foot { border-top: 1px solid var(--line); padding: 28px 0 44px; font-size: .9rem; }
.foot .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 14px 32px; }
.foot nav { display: flex; flex-wrap: wrap; gap: 8px 22px; }
.foot a { color: var(--paper-soft); }
.foot a:hover { color: var(--gold-hi); }

/* ---- Trang văn bản (quyền riêng tư, điều khoản) ---- */
.doc { width: min(760px, 100% - 48px); margin: 0 auto; padding: 24px 0 96px; }
.doc h1 { margin: 0 0 8px; font: 800 clamp(2.1rem, 5.5vw, 3.2rem)/1.05 var(--display); letter-spacing: -.02em; color: var(--paper); }
.doc .meta { margin: 0 0 36px; font-size: .92rem; opacity: .85; }
.doc h2 { margin: 2.3em 0 .5em; padding-left: 14px; border-left: 3px solid var(--gold); font: 700 1.3rem/1.3 var(--display); color: var(--paper); }
.doc p, .doc ul, .doc ol { margin: 0 0 1em; }
.doc ul, .doc ol { padding-left: 1.3em; }
.doc li > ul { margin: .4em 0 0; }
.doc li { margin-bottom: .4em; }
.doc li::marker { color: var(--gold); }
.doc code { padding: 1px 6px; border-radius: 5px; background: rgba(220, 164, 84, .14); color: var(--gold-hi); font-size: .92em; }
.doc table { width: 100%; margin: 1em 0 1.4em; border-collapse: collapse; font-size: .95rem; }
.doc th, .doc td { padding: 10px 12px; border: 1px solid var(--line); text-align: left; vertical-align: top; }
.doc th { background: rgba(220, 164, 84, .1); color: var(--paper); font-weight: 600; }

/* ---- Chuyển động nhẹ khi vào trang ---- */
@media (prefers-reduced-motion: no-preference) {
  /* fill-mode "backwards": xong animation thì trả lại style gốc (giữ được hover/rotate) */
  @keyframes rise { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: none; } }
  @keyframes rise-phone { from { opacity: 0; transform: translateY(20px) rotate(3deg); } to { opacity: 1; transform: rotate(3deg); } }
  .hero h1, .hero .lead, .hero .cta, .hero .note { animation: rise .7s cubic-bezier(.2, .7, .2, 1) backwards; }
  .hero .lead { animation-delay: .08s; }
  .hero .cta { animation-delay: .16s; }
  .hero .note { animation-delay: .22s; }
  .hero-art .phone { animation: rise-phone .9s .1s cubic-bezier(.2, .7, .2, 1) backwards; }
}

/* ---- Màn nhỏ ---- */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 40px; padding-top: 16px; }
  .hero-art { order: 2; }
  .features { grid-template-columns: 1fr; gap: 24px; }
  .features aside { position: static; padding-top: 24px; }
}
@media (max-width: 560px) {
  .wrap, .doc { width: calc(100% - 36px); }
  .top { flex-wrap: wrap; row-gap: 12px; }
  .top nav { gap: 16px; font-size: .88rem; }
  .top nav a[href^="#"] { display: none; }
  .brand span { font-size: 1.2rem; }
  .feat li { grid-template-columns: 1fr; gap: 2px; }
  .feat .tag { padding-top: 0; }
  .river { gap: 12px; }
}